Sheet transferring device and image forming device

Abstract

A sheet transferring device includes a feeding roller configured to feed a sheet; a transferring roller configured to transfer the sheet to the feeding roller; a sheet sensor configured to detect the sheet at a sheet transferring part from the transferring roller to the feeding roller; a measuring part configured to measure an interval of a rear end of a prior sheet and a head end of a following sheet based on a sheet detection signal of the sheet sensor; and a transferring control part configured to adjust a sheet transferring speed of the transferring roller so that the interval between the prior sheet and the following sheet is adjusted to a set value as corresponding to the interval measured by the measuring unit.

1. A sheet transferring device, comprising:
 a feeding roller configured to feed a sheet; 
 a transferring roller configured to transfer the sheet to the feeding roller; 
 a sheet sensor configured to detect the sheet at a sheet transferring part from the transferring roller to the feeding roller; 
 a measuring part configured to measure an interval between a rear end of a prior sheet and a head end of a following sheet passing through the sheet sensor; and 
 a transferring control part configured to determine, using the interval measured by the measuring part, an amount of deviation of the interval between the prior sheet and the following sheet from a set value and adjust a sheet transferring speed of the transferring roller based on the determined amount of deviation, 
 wherein the transferring control part adjusts a timing for stopping the transferring roller after the head end of the sheet transferred by the transferring roller reaches the feeding roller that is stopped, as corresponding to adjustment of the sheet transferring speed, so that a sheet length between the feeding roller and the transferring roller, when the transferring roller is stopped, is adjusted to the set value. 
 
   
   
     2. The sheet transferring device as claimed in  claim 1 , further comprising:
 an input part configured to set the set value of the sheet length between the feeding roller and the transferring roller by an operator. 
 
   
   
     3. An image forming device, comprising:
 a sheet transferring device, the sheet transferring device, including:
 a feeding roller configured to feed a sheet, 
 a transferring roller configured to transfer the sheet to the feeding roller, 
 a sheet sensor configured to detect the sheet at a sheet transferring part from the transferring roller to the feeding roller, 
 a measuring part configured to measure an interval between a rear end of a prior sheet and a head end of a following sheet passing through the sheet sensor, and 
 a transferring control part configured to determine, using the interval measured by the measuring part, an amount of deviation of the interval between the prior sheet and the following sheet from a set value and adjust a sheet transferring speed of the transferring roller based on the determined amount of deviation; 
 
 a sheet feeding tray configured to send out the sheet to the transferring roller; and 
 an image forming part configured to form an image on the sheet sent by the feeding roller, 
 wherein the transferring control part adjusts a timing for stopping the transferring roller after the head end of the sheet transferred by the transferring roller reaches the feeding roller that is stopped, as corresponding to adjustment of the sheet transferring speed, so that a sheet length between the feeding roller and the transferring roller, when the transferring roller is stopped, is adjusted to the set value. 
 
   
   
     4. The image forming device as claimed in  claim 3 , further comprising:
 an input part configured to set the set value corresponding to the sheet length between the feeding roller and the transferring roller by an operator. 
 
   
   
     5. The image forming device as claimed in  claim 3 , further comprising:
 an imaging part configured to image an image and convert the image to image data, 
 wherein the imaging part forms an image indicated by the image data generated by the imaging part, on the sheet fed by the feeding roller.